You can change folder icons on your Mac by copy-and-pasting any image you have into the folder's icon slot.

Carbon Folders by necramar To customize a file or folder icon, simply follow the steps below. You can use your own pictures as icons.

Spect from Steven Frank is based on a single, straightforward idea: separating image navigation from the Mac’s folder hierarchy. Point the app at a folder and tell it how deep to peer into subfolders ...